Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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No definition available.

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Revenues Capitalized contract costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Capitalized contract cost, amortization	$ 5,200	$ 14,000	$ 9,200	$ 18,600
Capitalized contract cost, net	93,887		93,887		$ 62,340
Pre-operational costs
Capitalized Contract Cost [Line Items]
Capitalized contract cost, net	18,782		18,782		4,522
Offshore asset mobilization costs
Capitalized Contract Cost [Line Items]
Capitalized contract cost, net	58,887		58,887		57,818
Vessel repositioning costs
Capitalized Contract Cost [Line Items]
Capitalized contract cost, net	$ 16,218		$ 16,218		$ 0